Perpetual calendar



FIG. 1 is a top perspective view of a perpetual calendar showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof the undisclosed rear being a mirror image;

FIG. 4 is an end elevational view thereof the undisclosed end being a mirror image;

FIG. 5 is a top perspective view of a second embodiment of FIG. 1;

FIG. 6 is a top plan view thereof;

FIG. 7 is a front elevational view thereof; and

FIG. 8 is a side elevational view thereof, the undisclosed side being a mirror image. 

The ornamental design for a perpetual calendar, as shown and described. 